s/IPKG_INSTALL/PACKAGE_INSTALL/
s/IPKG_INSTALL/PACKAGE_INSTALL/

According to the git log (e.g.,
7302c6263934c237da66719bd42505b6c05d10cc), there was a change in the
variable naming.  IPKG_INSTALL was renamed to PACKAGE_INSTALL some time
ago. classes/rootfs_ipk.bbclass currently uses PACKAGE_INSTALL instead
of IPKG_INSTALL.

Signed-off-by: Mario Domenech Goulart <addb47291ee169f330801ce73520b96f2eaf20ea@ossystems.com.br>
Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

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